CVE-2021-22892Public exploitNetwork attack vector

Unauthenticated email disclosure via observable validation differences

Published May 27, 2021 · Updated Aug 3, 2024

Information disclosure in Rocket.Chat Server allows remote attackers to enumerate users' email addresses without authentication. Email-enumeration and validation checks return observable differences for registered addresses, but the public record does not identify the responsible endpoint or code path. No account or user interaction is required, and exposure is limited to discovering registered email addresses.

CVSS severity7.5
High
EPSS probability1.86%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Rocket.Chat Server allows remote attackers to enumerate users' email addresses without authentication. Email-enumeration and validation checks return observable differences for registered addresses, but the public record does not identify the responsible endpoint or code path. No account or user interaction is required, and exposure is limited to discovering registered email addresses.

The record

CVE
CVE-2021-22892
Published
May 27, 2021
Updated
Aug 3, 2024
Vendor
Rocket.Chat Technologies Corp.
Product
Rocket.Chat
Classifications
CWE-200, CWE-203, T1589.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 27, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Fixed versions: 3.13, 3.12.2, 3.11.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Rocket.Chat Technologies Corp. · Rocket.Chatversion=Fixed versions: 3.13, 3.12.2, 3.11.3

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
CWE-203Observable Discrepancy
T1589.002Gather Victim Identity Information: Email Addresses

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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